Yeah I'd love to have an "incoming set" warning system... Sub might work, drone might work, boat might work, but I think what you really want is a personal bouy

Yeah I'd love to have an "incoming set" warning system... Sub might work, drone might work, boat might work, but I think what you really want is a personal bouy anchored to the seafloor a bit like the NOAA ones, but way closer to shore. Can anyone here comment on the practical, safety and / or legal aspects of doing that?